¿Sabéis de qué va el examen, no?

[ROBINDESBOIS]

Do you know what the exam consists of, don´t you?
Do you know what the exam is about?

Are these questions correct?
Better ideas?

[Rusty]

Do you know what the exam consists of, don´t you?
Do you know what the exam is about?

Are these questions correct?
Better ideas?With the one correction, both are correct questions. The latter is more commonplace.

[Perikles]

Also,

Do you know what topics the exam covers?
Do you know what will be tested in the exam?
etc.

[ROBINDESBOIS]

Thanks, I gues the first options are better to ask about the format of the exam?

[Awaken]

Thanks, I gues the first options are better to ask about the format of the exam?

Your first version is more about the format. The 2nd one is more general. It is common to simply ask:
What is the format of the exam?

You will answer hear: "What's on the exam?"